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Can
you use electrical tape to repair extension cords?
In
a letter of interpretation dated 12/16/1998 OSHA
addressed the concerns of an employer concerning
the use of electrical tape to repair minor damage
(abrasions and cuts of limited depth) on the outer
jacket of an extension cord. OSHA gives an in-depth
answer to an age-old question for construction
employers and employees.
Here
is OSHA's response and the information you need
when deciding to repair or replace that worn out
or damaged extension cord:
Generally,
electrical tape may be used to cover superficial
damage to cord jackets You ask whether there is
any prohibition against putting electrical tape
over these kinds of abrasions and nicks when there
is no damage beyond the jacket, the conductors
have not been scraped or exposed, and the insulation
inside the jacket has not been displaced or compressed.
Section
1926.416(e)(1) [of the construction regulations]
provides that "worn or frayed electrical cords
or cables shall not be used." Superficial nicks
or abrasions-those that only slightly penetrate
the outer jacket of a flexible cord, and do not
permit the cord to bend more in that area than
in the rest of the cord-do not normally render
a cord "worn or frayed." Therefore, there is no
need to repair or replace such a cord.
Recommendation
against taping
While
taping these incidental abrasions and cuts does
not necessarily violate any OSHA standard, we
recommend that employers not tape this type of
damage for two reasons. First, §1926.403(a) requires
that "all electrical conductors and equipment
shall be approved." This standard precludes the
use of approved electrical conductors and equipment
if their characteristics are significantly altered.
Applying electrical tape that is too thick or
applying too much of it could change the cord's
original flexibility and lead to internal damage.
Second, the depth of the abrasions and cuts cannot
be monitored to see if they get worse without
removing the tape.
It
should also be kept in mind that the heavy duty
extension cords commonly used on construction
sites are designed to withstand a hostile environment.
Damage to an extension cord that is bad enough
to consider taping may have caused damage beyond
the jacket.
Tape
may not be used to repair significant damage to
cord jackets
Repair
or replacement of a flexible cord (depending on
its gauge) is required when the outer jacket is
deeply penetrated (enough to cause that part of
the cord to bend more than the undamaged part)
or penetrated completely, or when the conductors
or their insulation inside are damaged.
Two
provisions of the standard prohibit the repair
of the jacket of a worn or frayed flexible cord
with electrical tape. Section 1926.403(a) requires
that the cord be approved. The original approval
of the cord was based on the types of materials
and construction used. As noted above, taping
the cord can change the flexibility characteristics
of the cord, which in turn can affect the amount
of stress in the adjacent areas. This is of particular
concern with respect to the grounding wire.
Also,
the jacket is designed both to prevent damage
to the conductors and insulators inside, and to
further insulate the conductors. Taped repairs
usually will not duplicate the cord's original
characteristics. In most cases neither the jacket's
strength nor flexibility characteristics will
be restored. Therefore, tape repairs of the jacket
may not be used to bring a worn or frayed flexible
cord into compliance.
In
addition, section §1926.405(g)(2)(iii) states
that "flexible cords shall be used only in continuous
lengths without splice or tap. Hard service flexible
cords No. 12 or larger may be repaired if spliced
so that the splice retains the insulation, outer
sheath properties, and usage characteristics of
the cord being spliced." This standard precludes
the repair of flexible cords smaller than No.
12.
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